Nice place, vary close to the city center, Khaosan road, Golden mountin and museums. If you want to visit museums, Grand Palace, Wat Pho, Wat Arun it is close, 20-30 min beautiful walk, or vary cheep taxi drive (around 2-3 euros up to 100 baht). 100m from apartman you can find 2 big 24h working markets (7-11) and some cheep and nice rastaurants are close. However if you want to eat local food on street you can have breakfast in front of this apartmant or lunch and dinner on the next corner.
So in global, this place is a little bit old but spacious and close to everything. Best that you can get for that amount of money.